Roll support for paper machine drainage foils

ABSTRACT

PAPER MACHINE DRAINAGE FOILS ARE SUPPORTED ON A FOIL PLATFORM WHICH IN TURN IS SUPPORTED ON A ROLL ASSEMBLY COMPRISING A ROLL SHELL HAVING A PROTECTIVE RUBBER CORE AND ROLL JOURNALS WHICH SUPPORT THE ROLL SHELL AT ITS ENDS, THE ROLL SHELL EXTENDS TRANSVERSELY ACROSS THE FILL WIDTH OF THE PAPER MACHINE AND SUPPORT FOR THE PLATFORM IS OBTAINED BY MULTIPLE PADS TRANSVERSELY SPACED ALONG THE ROLL SHELL AND CONNECTED BETWEEN THE SHELL AND THE PLATFORM. ADJUSTMENT NUTS LOCATED ON POST WHICH ARE CONNECTED TO THE ROLL JOURNALS FUNCTION TO CONTROL THE VERTICAL POSITIONING OF THE ROLL SHELL AND FOILS IN RELATION TO THE FOUDRINIER WIRE.

ROLL SUPPORT FOR PAPER MACHINE DRAINAGE FOILS Filed Oct. 30, 1970 L. TRUXA Jab. 1.6, 1973 2 Sheets-Sheet l FOURDRINIER FIG. 2

m BY/(JR LESLIE TRUXA Patent 'Agent ROLL SUPPORT FOR PAPER MACHINE DRAINAGE FOILS Filed Oct. 30, 1970 L. TRUXA Jan. 16, 1973 2 Sheets-Sheet 2 Q m U mm E E m m 0 n 0m 0m m mv l 3 mm Q E m m w WV Q mm mm wm mm mm L c l e I L o c g fi m Q mm} mm o@ mm v w w I v v 9 0% m mm Patent Aqenl United States Patent Int. (:1. but 1/36 US. Cl. 162--354 3 Claims ABSTRACT OF THE DISCLOSURE Paper machine drainage foils are supported on a foil platform which in turn is supported on a roll assembly comprising a roll shell having a protective rubber coverand roll journals which support the roll shell at its ends. The roll shell extends transversely across the fill width of the paper machine and support for the platform is obtained by multiple pads transversely spaced along the roll shell and connected between the shell and the platform. Adjustment nuts located on posts which are connected to the roll journals function to control the vertical positioning of the roll shell and foils in relation to the Fourdrinier wire.

BACKGROUND OF THE INVENTION This invention is directed to a foil mounting arrangement for use in web forming machine, particularly paper making machines, the application being a continuation-in part of application Ser. No. 758,306, filed Sept. 9, 1968; now abandoned. I

'In the operation of web forming machines such as paper machines a layer of stock in liquid form is passed through a slice and deposited upon a moving Fourdrinier wire, to be dewatered. The extraction of water from the lower surface of the moving Fourdrin'ier wire has in the past been accomplished by rotating table rolls which by the fact of their rotation with the passage of the Fourdrinier wire thereover tends to suck water from the lower wire surface.

A comparatively recent development has been the introduction of water extraction foils, both of fixed and variable camber as a substitute for the table rolls. Owing to certain inherent operating characteristics such foils afford improved operation of the wet end of a web forming machine, and such machines may beneficially be converted from table rolls to the use of foils.

Owing to the considerable transverse" extent of paper machines, which have spans in the order of 300 inches or more, the superstructure necessary to support a water exeraction foil in substantially unchanging relation with the undersurface of the wire over such extended spans necessitates the provision of a rigid support structure to ensure the required rigidity.

Certain aspects of the prior art is seen in the arrangements shown in US. Pats. Nos. 3,105,789, assigned to the present assignee, and No. 3,332,838.

The present invention provides an improved foil support structure of single, readily installed form, particularly suited for incorporating the superseded table rolls, by adaption. In carrying out the invention by means of such adaption it is necessary to maintain the desired spacial relationship between the effective foil working surface and the undersurface of the wire.

One problem posed by the utilization of table rolls as foil support structure is that while in operation a table roll presents a substantially level upper working surface in sup- "ice porting and Water extracting relation with the Fourdrinier wire passing thereover, the presentation of such alevel surface is made possible in part by the rotation of the roll, which tends to straighten the roll into a nonsagging position. However, at standstill, such rolls generally sag in the center due to self weight. Accordingly it is necessary in utilizing a table roll as a supporting structure for a superposed water extraction foil to make provision for the sag of the roll. In practice it has been found that such correction is most easily effected by securing the foil attachment structure to the upper surface of the roll and then machining the foil attachment means to provide the requisite level. supporting surface on which to mount the foil proper.

A particular benefit obtained in utilizing a foil support structure of hollow tube or roll form is the achievement of high resistance against twisting about the axis of the, support. This is particularly significant in relation to the angular sensitivity of tfoils, where A2 deflection variation can cause a marked change in drainage rate. The need for uniformity in drainage in the cross machine direction will be appreciated by those skilled in the art.

One obvious advantage afforded in adopting an existing table roll is the freedom from corrosion that the roll cover provides.

It will be understood that the present invention is susceptible of use with fixed section and/or adjustable section water extraction foils, which are per so well knownin the art.

A preferred embodiment of the invention is described for purposes of illustration reference being had to the accompanying drawings wherein:

FIG. 1 is a side view in part section showing a foil mounting arrangement according to the present invention;

FIG. 2 is a side view corresponding to FIG. 1, illustrating the working relationship between a mounted foil and. the-Fourdrinier wire of a paper machine; and

FIG. 3 is a back view of the arrangement according to FIG. 1' looking toward the wet end of the machine.

Referring to .FIGS. 1 and 3 the foil mounting arrangement 10 comprises a roll assembly 12 in which a pair roll journals 14 support a roll shell 16 by way of end plates 18, the shell 16 being coextensive in the crossmachine direction with the foils 22 and having a resilient rubber cover 20 over the sunface thereof to preclude stock contamination.

Referring to FIG. 2, the foils 22 each have an upper surface 24 in supporting relation with the Fourdrinier lower surface 26, which constitutes the effective machine datum previously determined by the upper surface of the table roll 12.

The roll mounting arrangement of the illustrated embodiment comprises a pair of journal side plates 32 secured to the roll journal 14 as by welding, and attached to a bearer 34 secured to a pair of bearer support posts 36 (only one of which is illustrated). A pair of adjustment nuts 38 provides vertical positioning of the bearer 34 on the related posts 36, for the vertical positioning of the foils 22 in relation to the Fourdrinier bottom surface 26. The post 36 extends upwardly from a housing 40 which is carried by the support 42, having side clamps 44 adjustably attached thereto by means of a nut and bolt arrangement 46. The provision of adjustable side clamps is particularly suited for use with support structures such as the top flange of a dovetail or T-section attached to the top of the Fourdrinier beam.

Mounting of the foil support structure to the surface of the roll is achieved by means of mounting pad arrangement 50 in which a plurality of transversely spaced pads 52 generally uniformly distributed along the length of the roll 12 are secured to the surface of the roll by means of retainingcap screws 54, in conjunction with locating pins or set screws 56. From each of the pads 52 a web plate 58 extendslupwardly in supporting relation with the foil platform 60, to which the fixed front portion of the foil is secured as by bolting, or in other suitable fashion.

The foil adjustment assembly 70 is mounted at one or both ends of the roll by means of bracket 72 in supporting relation with a plate 74 carrying an end plate 76 to which an indicator 78 is attached, being in the form of angle section, the upper surface of which is graduated as an indicator surface. A pedestal 80 secured to the plate 74 receives the foil adjustment bolt 82, secured in relation thereto by means of adjusting and locking nuts 84. Adjustment of the1bolt 82 relative to the fixed pedestal 80 positions the foil cam plate 94 in relation to the immovable portion of the foil, in the case of an adjustable foil.

In effecting the conversion of a table roll the method of procedure to be followed, which the foregoing structure permits being carried out remote from the paper machine, comprises the steps of attaching the roll mounting assembly 30 to the journals 14 of the roll 12, locating and attaching the mounting pad assemblies 50 in aligned and uniform arrangement, and securing the web plates 58 and foil platform 60 thereto. This method of assembly includes the step of machining the assembled foil mount, either by levellingthe'top of the web plates 58, or the foil platform 60 prior to the assembly of the foils 22 thereon, so that accurate levelling of the foils transversely of the machine is obtained despite any sag in the roll 12, which is a generally inherent characteristic of such table rolls.

Certain advantages provided by the foregoing structure include interchangeability of foil mounting, a substantial financial saving in the adaptation of foils to an existing Fourdrinier section, and ready adjustment of the foils of the Fourdrinier section during operation of the machine. In addition to the foregoing, it will be understoodzthat the number of foils which may be substituted for atable roll is not limited to the pair of foils illustrated, and that the foils may be of the adjustable type, or alternatively of the more simple fixed type of foil.

What I claim as new and desire to secure by Letters Patent of the United States is:

1. A water extraction device for use in a web forming machine having a stretched Fourdrinier wire in running relation therein to provide a web forming surface when in operation, including at least one Water extraction foil member extending transversely of said wire, having a top working surface extending in supporting relation with the Wire to draw water therefrom, platform means coextensive in the cross-machine direction with the foil in supporting relation therewith, a plurality of spaced mounting means extending downwardly from said platform means to support said foil in substantially uniform wire supporting relation, tubular support means extending transversely the full width of the machine having said mounting means secured thereto, and mounting means attached to the ends of said tubular supporting means, for securing said support means transversely of the machine structure in predetermined spaced relation beneath said wire said tubular support having a metallic shell with a protective resilient cover extending over the face thereof to preclude stock contamination, said mounting means extending through the cover and secured to the shell whereby said foil is supportedin substantially non-resilient relation relative to the wire.

2. The device as claimed in claim 1 having a plurality of said water extraction foil members mounted on said platform means in sequential water extracting relation.

3. The device as claimed in claim 1, said tubular support mounting means including height adjustment means to permit variation in the spacing of said tubular support means beneath said wire for levelling said foil.

References Cited UNITED STATES PATENTS 3,298,904 l/ 1967 LeCompte 162-279 X 3,269,893 8/1966 Rojecki l62358 X 3,218,228 11/1965 Wagenknecht l62374 X 3,201,308 8/1965 Goddard et al. l62374 X 3,105,789 10/1963 Goddard l62352 3,578,557 5/1971 Tidbury l6230'l 3,332,838 7/1967 Lee 162---352 S. LEON 1 3ASHORE, Primary Examiner R. H, TUSHIN, Assistant Examiner US. 01. X.R. 162 199, 272, 352,- 374 

